Something seems to have broken in 2.6.23-rc2, and I'm not sure what, orwhere I should look for further debugging. The info I have:

On my 2.6.23-rc2 desktop, things run fine.

On my test server, built from the same source tree, networking goesstrange every few minutes, with the following symptoms:

o) running ping against the server, the first ping goes through;further pings go AWOL until about icmp_seq=30, when I get 4-5 icmpreplies (marked as DUP!), then no pings for a while, then dups, and soon.

o) the server doesn't see ARP replies. According to tcpdump, the serverwill send eg "who has 192.168.0.2? tell 192.168.0.1"; the client inquestion will recieve the packet and send a response, but nothing showsup in the server-side tcpdump.

o) after a few minutes of random network troubles, everything will workfine again, (ping is normal, arp replies are seen, tcp sessions work)for a few minutes.

o) The server's dmesg shows lots of "short udp packet" messages

o) ifdown then ifup'ing the interfaces fixes things, temporarily.

Reverting to 2.6.22, everything seems to be running fine (but no lguest,which is what I came for :( )

I've also tried with the latest code from git, the behaviour is the sameas 2.6.23-rc2.